Data points: 119
The readout for GPT-4o and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
119 data points
Includes 27 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 37 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
Model compare GPT-4o vs GPT-5.3 Codexgpt-4o-vs-gpt-5-3-codex | Model A GPT-4o | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Average speed, First-token latency | Cheapest input price, Free providers, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-4o
42.8
Avg. score
GPT-5.3 Codex
67.6
Selected category
Agents
GPT-5.3 Codex leads by 46.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-4o
42.0
Rank #56/82 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner82.0
Rank #8/82 · confidence 1 · eval date 2026-02-05
GPT-4o
winner0.56 s
Rank #9/78 · confidence 4
GPT-5.3 Codex
55.47 s
Rank #69/78 · confidence 4
GPT-4o
winner0.56 s
Rank #11/78 · confidence 4
GPT-5.3 Codex
55.47 s
Rank #74/78 · confidence 4
GPT-4o
winner117.2 tok/s
Rank #30/78 · confidence 4
GPT-5.3 Codex
94.2 tok/s
Rank #35/78 · confidence 4
GPT-4o
winner$10.00/M
Rank #67/95 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #75/95 · confidence 4
GPT-4o
$2.50/M
Rank #77/95 · confidence 4
GPT-5.3 Codex
winner$1.75/M
Rank #69/95 · confidence 4
GPT-4o
winner$4.38/M
Rank #72/95 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #75/95 · confidence 4
GPT-4o
44.4
Rank #41/58 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner87.7
Rank #3/58 · confidence 1 · eval date 2026-02-05
GPT-4o
52.1%
Rank #97/103 · confidence 4
GPT-5.3 Codex
winner91.5%
Rank #6/103 · confidence 4
GPT-4o
2.9%
Rank #103/103 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #8/103 · confidence 4
GPT-4o
8.3
Rank #52/59 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner53.0
Rank #5/59 · confidence 1 · eval date 2026-02-05
GPT-4o
31.6
Rank #57/70 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner83.6
Rank #6/70 · confidence 1 · eval date 2026-02-05
GPT-4o
33.3
Rank #52/63 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner53.2
Rank #7/63 · confidence 1 · eval date 2026-02-05
GPT-4o
33.1%
Rank #73/101 · confidence 4
GPT-5.3 Codex
winner53.2%
Rank #8/101 · confidence 4
GPT-4o
19.7
Rank #51/58 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner51.8
Rank #3/58 · confidence 1 · eval date 2026-02-05
GPT-4o
54.3
Rank #60/63 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner91.5
Rank #4/63 · confidence 1 · eval date 2026-02-05
GPT-4o
33.2
Rank #59/67 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner89.3
Rank #4/67 · confidence 1 · eval date 2026-02-05
GPT-4o
3.3
Rank #62/63 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner39.9
Rank #5/63 · confidence 1 · eval date 2026-02-05
GPT-4o
11.2
Rank #58/66 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner44.3
Rank #6/66 · confidence 1 · eval date 2026-02-05
GPT-4o
37.9
Rank #49/58 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner86.9
Rank #16/58 · confidence 1 · eval date 2026-02-05
GPT-4o
42.0
Rank #35/52 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner95.2
Rank #5/52 · confidence 1 · eval date 2026-02-05
GPT-4o
62.0
Rank #32/60 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner91.3
Rank #2/60 · confidence 1 · eval date 2026-02-05
GPT-4o
874.0
Rank #47/48 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner1205.0
Rank #32/48 · confidence 1 · eval date 2026-02-05
GPT-4o
59.9
Rank #43/58 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner87.8
Rank #7/58 · confidence 1 · eval date 2026-02-05
GPT-4o
34.3
Rank #56/60 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner75.4
Rank #8/60 · confidence 1 · eval date 2026-02-05
GPT-4o
38.3
Rank #50/68 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner78.7
Rank #10/68 · confidence 1 · eval date 2026-02-05
GPT-4o
25.1
Rank #52/58 · confidence 1 · eval date 2024-05-13
GPT-5.3 Codex
winner86.0
Rank #21/58 · confidence 1 · eval date 2026-02-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-4o | GPT-5.3 Codex |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-4o | GPT-5.3 Codex |
|---|---|---|
20 tests | GPT-4o speed / latency 88 tok/s / 1593ms input / output No data | GPT-5.3 Codex |
This report only uses LMSpeed data for GPT-4o and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-4o | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | GPT-4o GPT-4o is stronger when you prioritize Average speed, First-token latency. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Free providers, Provider coverage, Recent tests. |
TL;DR: GPT-5.3 Codex leads across 119 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-4o vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | GPT-4o exposes 128K tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 128K tokens | 400K tokens |
| Max output | 16.4K tokens | 128K tokens |
| Released | Nov 2024 | Feb 2026 |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeWeb search | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2023-10-31 | No data |
| OpenRouter ID | openai/gpt-4o-2024-11-20 | openai/gpt-5.3-codex |
| References | No data | No data |
speed / latency
N/A / N/A
input / output
No data
CatClaw API10 tests | GPT-4o speed / latency 57 tok/s / 3381ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
QQ Code10 tests | GPT-4o speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 57 tok/s / 2985ms input / output No data |
|---|
小水管 API10 tests | GPT-4o speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
|---|
DuckCoding5 tests | GPT-4o speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 21 tok/s / 2445ms input / output No data |
|---|
GPT-4o gpt-4o-all-c speed / latency No data input / output $0.0082/M / $0.0082/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $0.216/M / $1.73/M |
GPT-4o gpt-4o-all speed / latency No data input / output $0.0082/M / $0.0082/M | GPT-5.3 Codex gpt-5.3-codex-medium speed / latency No data input / output $0.240/M / $1.92/M |
GPT-4o gpt-4o-all speed / latency No data input / output $0.0082/M / $0.0082/M | GPT-5.3 Codex gpt-5.3-codex-medium speed / latency No data input / output $0.240/M / $1.92/M |
GPT-4o gpt-4o-all speed / latency No data input / output $0.012/M / $0.012/M | GPT-5.3 Codex gpt-5.3-codex-medium speed / latency No data input / output $0.360/M / $2.88/M |
GPT-4o gpt-4o-all speed / latency No data input / output $0.016/M / $0.016/M | GPT-5.3 Codex gpt-5.3-codex-medium speed / latency No data input / output $0.479/M / $3.84/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
